The acceleration due to gravity at a height \( 1 \mathrm{~km} \) above the earth is the same as ...

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The acceleration due to gravity at a height \( 1 \mathrm{~km} \) above the earth is the same as at a depth \( d \) below the surface of earth. Then,
(a) \( d=\frac{1}{2} \mathrm{~km} \)
(b) \( d=1 \mathrm{~km} \)
(c) \( d=\frac{3}{2} \mathrm{~km} \)
(d) \( d=2 \mathrm{~km} \)
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